One of the parts in the backflow protector. Not recommended to sterilize due to its rubber material. Will affect suction of the breastpump with wear and tear For Old designed (twisting mechanism) back flow protector

Premium New Act as a physical barrier between milk and the pump motor to prevent milk from flowing to the pump. Part connecting to Spectra breastshield is fragile. When slotting into Spectra breastshield, too tight will result in difficulties pulling out. BPA free Premium Old (Twisting Mechanism) Act as a physical barrier between milk and the pump motor to prevent…